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Thermodynamic: Conservation of Energy Question

  1. Jan 30, 2012 #1
    1. The problem statement, all variables and given/known data

    The mixing tank shown here initially contains 50 kg of water at 25°C. Suddenly the two valves and the single outlet valve are opened so that two water streams, each with a flow rate of 5 kg/min, flow into the tank, and a single exit stream with a flow rate of 10 kg/min leaves the tank. The temperature of one inlet stream is 80°C, and that of the other is 50°C. the tank is well mixed, so that the temperature of the outlet stream is always the same as the temperature of the water in the tank.

    My (wrong) approach

    I let the final temperature be T, and tried to find the equilibrium temperature using heat capacity. However, I am unable to get the correct answer.
  2. jcsd
  3. Feb 1, 2012 #2

    rude man

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    What answer did you get? Show your work.
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